diff --git a/src/ai/ai_instance.cpp b/src/ai/ai_instance.cpp
index 2333ddd2e2..b99b8a1082 100644
--- a/src/ai/ai_instance.cpp
+++ b/src/ai/ai_instance.cpp
@@ -22,7 +22,7 @@
 #include "ai_gui.hpp"
 
 /* Convert all AI related classes to Squirrel data.
- * Note: this line a marker in squirrel_export.sh. Do not change! */
+ * Note: this line is a marker in squirrel_export.sh. Do not change! */
 #include "api/ai_accounting.hpp.sq"
 #include "api/ai_airport.hpp.sq"
 #include "api/ai_base.hpp.sq"
diff --git a/src/ai/api/squirrel_export.sh b/src/ai/api/squirrel_export.sh
index 90b506b327..5bd05a0978 100755
--- a/src/ai/api/squirrel_export.sh
+++ b/src/ai/api/squirrel_export.sh
@@ -73,7 +73,7 @@ echo "
 /SQAIController_Register/ { print \$0; next }
 /SQAI.*_Register/ { next }
 
-/Note: this line a marker in squirrel_export.sh. Do not change!/ {
+/Note: this line is a marker in squirrel_export.sh. Do not change!/ {
 	print \$0
 	gsub(\"^.*/\", \"\")
 	split(\"`grep '^void SQAI.*_Register(Squirrel \*engine)$' *.hpp.sq | sed 's/:.*$//' | sort | uniq | tr -d '\r' | tr '\n' ' '`\", files, \" \")