diff --git a/README.md b/README.md
index b6bf245..63e239a 100644
--- a/README.md
+++ b/README.md
@@ -27,11 +27,11 @@ If you prefer an email, contact me at `toolleeo@gmail.com`.
 
 # Summary
 
-To date, **636** apps/tools covered, divided in **43** categories.
+To date, **637** apps/tools covered, divided in **43** categories.
 
 # Index
 
-[Backup](#backup) (8) | [Calculators](#calc) (4) | [Chat and instant messaging](#chat) (8) | [Conversion](#conversion) (6) | [Data management](#data-management) (29) | [Data transfer](#transfer) (29) | [Directory changers](#cd) (8) | [Disk usage analyzers](#disk-analyzer) (8) | [Editors](#editors) (21) | [Email](#email) (11) | [File and file system handling](#file-handling) (32) | [File manager](#file-manager) (10) | [File renamers](#file-renamer) (6) | [File systems](#file-system) (3) | [Font management](#font) (2) | [Funny tools](#funny) (15) | [Games](#games) (33) | [Git and accessories](#git) (22) | [Graphics](#graphics) (15) | [Multimedia](#multimedia) (3) | [Networking](#networking) (16) | [Note taking](#note-taking) (13) | [Office tools](#office) (15) | [Organizers and calendars](#organizers) (13) | [Online search and resources](#online) (7) | [Password managers](#password-manager) (10) | [Productivity](#productivity) (21) | [Programming](#programming) (19) | [Science](#science) (8) | [Security and encryption](#security) (11) | [Shells](#shells) (5) | [Sound and music](#music) (24) | [System monitoring](#monitor) (26) | [System tools](#system) (21) | [Terminals](#terminal) (9) | [Text processing](#text-processing) (34) | [Text search](#text-search) (9) | [Todo managers](#todo-manager) (18) | [Utilities](#utility) (26) | [Versioning](#versioning) (5) | [Viewers](#viewers) (24) | [Web browser](#browser) (16) | [Web development](#webdev) (13)
+[Backup](#backup) (8) | [Calculators](#calc) (4) | [Chat and instant messaging](#chat) (8) | [Conversion](#conversion) (6) | [Data management](#data-management) (29) | [Data transfer](#transfer) (29) | [Directory changers](#cd) (8) | [Disk usage analyzers](#disk-analyzer) (8) | [Editors](#editors) (21) | [Email](#email) (11) | [File and file system handling](#file-handling) (32) | [File manager](#file-manager) (10) | [File renamers](#file-renamer) (6) | [File systems](#file-system) (3) | [Font management](#font) (2) | [Funny tools](#funny) (15) | [Games](#games) (33) | [Git and accessories](#git) (22) | [Graphics](#graphics) (15) | [Multimedia](#multimedia) (3) | [Networking](#networking) (16) | [Note taking](#note-taking) (13) | [Office tools](#office) (15) | [Organizers and calendars](#organizers) (13) | [Online search and resources](#online) (7) | [Password managers](#password-manager) (10) | [Productivity](#productivity) (21) | [Programming](#programming) (19) | [Science](#science) (8) | [Security and encryption](#security) (12) | [Shells](#shells) (5) | [Sound and music](#music) (24) | [System monitoring](#monitor) (26) | [System tools](#system) (21) | [Terminals](#terminal) (9) | [Text processing](#text-processing) (34) | [Text search](#text-search) (9) | [Todo managers](#todo-manager) (18) | [Utilities](#utility) (26) | [Versioning](#versioning) (5) | [Viewers](#viewers) (24) | [Web browser](#browser) (16) | [Web development](#webdev) (13)
 
 Some links to [related resources](#resources).
 
@@ -520,6 +520,7 @@ Some links to [related resources](#resources).
 ## <a name="security"></a>Security and encryption
 
 * [cipher](https://github.com/ash-shell/cipher) - An Ash module that makes it easy to perform aes-256-cbc encryption for files and directories.  
+* [cotp](https://github.com/replydev/cotp) - Trustworthy, encrypted, command-line TOTP/HOTP authenticator app with import functionality.
 * [cream](https://git.z3bra.org/cream/files.html) - Encrypt and decrypt streams of data with only a master password. The key is derivated from the password + salt combo, and used to encrypt data byte per byte.
 * [encfs](http://www.arg0.net/#!encfs/c1awt) - Encrypted filesystem in user-space based on [FUSE](https://it.wikipedia.org/wiki/FUSE); mounts an encrypted directory into a clear one.  
 * [Firejail](https://firejail.wordpress.com/) - A SUID program that reduces the risk of security breaches by restricting the running environment of untrusted applications using Linux namespaces and seccomp-bpf.
diff --git a/data/apps.csv b/data/apps.csv
index 5d2947a..41ead45 100644
--- a/data/apps.csv
+++ b/data/apps.csv
@@ -635,3 +635,4 @@ utility,Lakshmi,,https://github.com/sarvjeets/lakshmi,Investing library and comm
 system,pypi-command-line,,https://github.com/wasi-master/pypi-command-line,"A powerful, colorful, beautiful command-line-interface for pypi.org."
 security,Minisign,,https://github.com/jedisct1/minisign,A dead simple tool to sign files and verify digital signatures.
 git,gitsummary,,https://github.com/glenreesor/gitsummary,"A better git status taht lists stashes, file statuses, branch list, all nicely formatted with color."
+security,cotp,,https://github.com/replydev/cotp,"Trustworthy, encrypted, command-line TOTP/HOTP authenticator app with import functionality."