diff --git a/src/tools/cuebreakpoints.c b/src/tools/cuebreakpoints.c
index fd97dfd..52043a0 100644
--- a/src/tools/cuebreakpoints.c
+++ b/src/tools/cuebreakpoints.c
@@ -14,9 +14,9 @@
 
 #if HAVE_CONFIG_H
 #include "config.h"
-#else
+#else /* not HAVE_CONFIG_H */
 #define PACKAGE_STRING "cuebreakpoints"
-#endif
+#endif /* HAVE_CONFIG_H */
 
 char *progname;
 
diff --git a/src/tools/cueconvert.c b/src/tools/cueconvert.c
index ff63649..ebd438a 100644
--- a/src/tools/cueconvert.c
+++ b/src/tools/cueconvert.c
@@ -13,9 +13,9 @@
 
 #if HAVE_CONFIG_H
 #include "config.h"
-#else
+#else /* not HAVE_CONFIG_H */
 #define PACKAGE_STRING "cueconvert"
-#endif
+#endif /* HAVE_CONFIG_H */
 
 char *progname;
 
diff --git a/src/tools/cueprint.c b/src/tools/cueprint.c
index c0c2a88..f93f8d2 100644
--- a/src/tools/cueprint.c
+++ b/src/tools/cueprint.c
@@ -14,9 +14,9 @@
 
 #if HAVE_CONFIG_H
 #include "config.h"
-#else
+#else /* not HAVE_CONFIG_H */
 #define PACKAGE_STRING "cueprint"
-#endif
+#endif /* HAVE_CONFIG_H */
 
 /* default templates */