diff --git a/plugins/fn-complex/functions.c b/plugins/fn-complex/functions.c
index 360ef0e4c..6119d3c2c 100644
--- a/plugins/fn-complex/functions.c
+++ b/plugins/fn-complex/functions.c
@@ -1109,7 +1109,7 @@ static GnmFuncHelp const help_imigamma[] = {
 	{ GNM_FUNC_HELP_ARG, F_("z:a complex number")},
 	{ GNM_FUNC_HELP_ARG, F_("lower:if true (the default), the lower incomplete gamma function, otherwise the upper incomplete gamma function")},
 	{ GNM_FUNC_HELP_ARG, F_("regularize:if true (the default), the regularized version of the incomplete gamma function")},
-	{ GNM_FUNC_HELP_NOTE, F_("The regularized incomplete gamma function is the unregularized incomplete gamma function divided by gamma(@{a}).") },
+	{ GNM_FUNC_HELP_NOTE, F_("The regularized incomplete gamma function is the unregularized incomplete gamma function divided by GAMMA(@{a}).") },
 	{ GNM_FUNC_HELP_EXAMPLES, "=IMIGAMMA(2.5,-1.8,TRUE,TRUE)" },
 	{ GNM_FUNC_HELP_EXAMPLES, "=IMIGAMMA(2.5,-1.8,TRUE,TRUE)" },
 	{ GNM_FUNC_HELP_SEEALSO, "GAMMA,IMIGAMMA"},
diff --git a/plugins/fn-math/functions.c b/plugins/fn-math/functions.c
index 7abfc4399..0e295c162 100644
--- a/plugins/fn-math/functions.c
+++ b/plugins/fn-math/functions.c
@@ -1066,7 +1066,7 @@ static GnmFuncHelp const help_igamma[] = {
 	{ GNM_FUNC_HELP_ARG, F_("lower:if true (the default), the lower incomplete gamma function, otherwise the upper incomplete gamma function")},
 	{ GNM_FUNC_HELP_ARG, F_("regularize:if true (the default), the regularized version of the incomplete gamma function")},
 	{ GNM_FUNC_HELP_ARG, F_("real:if true (the default), the real part of the result, otherwise the imaginary part")},
-	{ GNM_FUNC_HELP_NOTE, F_("The regularized incomplete gamma function is the unregularized incomplete gamma function divided by gamma(@{a})") },
+	{ GNM_FUNC_HELP_NOTE, F_("The regularized incomplete gamma function is the unregularized incomplete gamma function divided by GAMMA(@{a})") },
 	{ GNM_FUNC_HELP_NOTE, F_("This is a real valued function as long as neither @{a} nor @{z} are negative.") },
 	{ GNM_FUNC_HELP_EXAMPLES, "=IGAMMA(2.5,-1.8,TRUE,TRUE,TRUE)" },
 	{ GNM_FUNC_HELP_EXAMPLES, "=IGAMMA(2.5,-1.8,TRUE,TRUE,FALSE)" },
