diff --git a/src/engine/renderer/tr_image.cpp b/src/engine/renderer/tr_image.cpp
index 65338df23c..a92a4034dd 100644
--- a/src/engine/renderer/tr_image.cpp
+++ b/src/engine/renderer/tr_image.cpp
@@ -2536,6 +2536,8 @@ static void R_CreateShadowMapFBOImage()
 	int numFactor = 1;
 	int format = IF_NOPICMIP;
 
+	/* FIXME: We should test if those formats are supported
+	and if r_highPrecisionRendering is enabled. */
 	switch( glConfig2.shadowingMode )
 	{
 		case shadowingMode_t::SHADOWING_ESM16:
@@ -2619,6 +2621,8 @@ static void R_CreateShadowCubeFBOImage()
 
 	int format = IF_NOPICMIP;
 
+	/* FIXME: We should test if those formats are supported
+	and if r_highPrecisionRendering is enabled. */
 	switch( glConfig2.shadowingMode )
 	{
 		case shadowingMode_t::SHADOWING_ESM16: