diff --git a/docs/PIXEL_MASK.md b/docs/PIXEL_MASK.md
index d40de74e..143f0fd5 100644
--- a/docs/PIXEL_MASK.md
+++ b/docs/PIXEL_MASK.md
@@ -10,13 +10,13 @@ Bit values are set as follows:
 
 Bit 0 - gap (pixel with no sensor)
 
-Bit 1 - pixel doesn't set proper gain during pedestal (JUNGFRAU only)
+Bit 1 - error pixel (for PSI JUNGFRAU: pixel doesn't set proper gain during pedestal, for DECTRIS: pixel is part of detector pixel mask)
 
-Bit 2 - pixel pedestal G0 RMS is over threshold (JUNGFRAU only)
+Bit 4 - noisy pixel (for PSI JUNGFRAU: pixel pedestal G0 RMS is over threshold, for DECTRIS: pixel was flagged with signal during dark data collection at initialization)
 
 Bit 8 - user defined mask
 
-Bit 30 - module edge
+Bit 30 - module edge (only for PSI systems)
 
 Bit 31 - chip edge interpolated pixel (multipixel)