diff --git a/scripts/ZoneMinder/lib/ZoneMinder/ConfigData.pm.in b/scripts/ZoneMinder/lib/ZoneMinder/ConfigData.pm.in
index 450896017..562fa0ad4 100644
--- a/scripts/ZoneMinder/lib/ZoneMinder/ConfigData.pm.in
+++ b/scripts/ZoneMinder/lib/ZoneMinder/ConfigData.pm.in
@@ -1296,7 +1296,7 @@ body = "ZM alarm detected - %EL% secs, %EF%/%EFA% frames, t%EST%/m%ESM%/a%ESA% s
 		name => "ZM_WEB_H_SCALE_THUMBS",
 		default => "no",
 		description => "Scale thumbnails in events, bandwidth versus cpu in rescaling",
-		help => "If unset, this option sends the whole image to the browser which resizes it in the window. If set the image is scaled down on the server before sending a reduced size image to the browser to conserve bandwidth at the cost of cpu on the server",
+		help => "If unset, this option sends the whole image to the browser which resizes it in the window. If set the image is scaled down on the server before sending a reduced size image to the browser to conserve bandwidth at the cost of cpu on the server. Note that ZM can only perform the resizing if the appropriate PHP graphics functionality is installed. This is usually available in the php-gd package.",
 		type => $types{boolean},
 		category => "highband",
 	},
@@ -1417,7 +1417,7 @@ body = "ZM alarm detected - %EL% secs, %EF%/%EFA% frames, t%EST%/m%ESM%/a%ESA% s
 		name => "ZM_WEB_M_SCALE_THUMBS",
 		default => "yes",
 		description => "Scale thumbnails in events, bandwidth versus cpu in rescaling",
-		help => "If unset, this option sends the whole image to the browser which resizes it in the window. If set the image is scaled down on the server before sending a reduced size image to the browser to conserve bandwidth at the cost of cpu on the server",
+		help => "If unset, this option sends the whole image to the browser which resizes it in the window. If set the image is scaled down on the server before sending a reduced size image to the browser to conserve bandwidth at the cost of cpu on the server. Note that ZM can only perform the resizing if the appropriate PHP graphics functionality is installed. This is usually available in the php-gd package.",
 		type => $types{boolean},
 		category => "medband",
 	},
@@ -1538,7 +1538,7 @@ body = "ZM alarm detected - %EL% secs, %EF%/%EFA% frames, t%EST%/m%ESM%/a%ESA% s
 		name => "ZM_WEB_L_SCALE_THUMBS",
 		default => "yes",
 		description => "Scale thumbnails in events, bandwidth versus cpu in rescaling",
-		help => "If unset, this option sends the whole image to the browser which resizes it in the window. If set the image is scaled down on the server before sending a reduced size image to the browser to conserve bandwidth at the cost of cpu on the server",
+		help => "If unset, this option sends the whole image to the browser which resizes it in the window. If set the image is scaled down on the server before sending a reduced size image to the browser to conserve bandwidth at the cost of cpu on the server. Note that ZM can only perform the resizing if the appropriate PHP graphics functionality is installed. This is usually available in the php-gd package.",
 		type => $types{boolean},
 		category => "lowband",
 	},
@@ -1618,7 +1618,7 @@ body = "ZM alarm detected - %EL% secs, %EF%/%EFA% frames, t%EST%/m%ESM%/a%ESA% s
 		name => "ZM_WEB_P_SCALE_THUMBS",
 		default => "yes",
 		description => "Scale thumbnails in events, bandwidth versus cpu in rescaling",
-		help => "If unset, this option sends the whole image to the browser which resizes it in the window. If set the image is scaled down on the server before sending a reduced size image to the browser to conserve bandwidth at the cost of cpu on the server",
+		help => "If unset, this option sends the whole image to the browser which resizes it in the window. If set the image is scaled down on the server before sending a reduced size image to the browser to conserve bandwidth at the cost of cpu on the server. Note that ZM can only perform the resizing if the appropriate PHP graphics functionality is installed. This is usually available in the php-gd package.",
 		type => $types{boolean},
 		category => "phoneband",
 	},