diff --git a/src/THcShowerPlane.h b/src/THcShowerPlane.h
index 9bf2388a3975f2327f2b287a800689911fa6048e..8cb7e141d6c2cf355d56a25a50f62dc98a3f1356 100644
--- a/src/THcShowerPlane.h
+++ b/src/THcShowerPlane.h
@@ -109,9 +109,9 @@ public:
 protected:
 
   Double_t*   fA_Pos;         // [fNelem] ADC amplitudes of blocks
-  Double_t*   fA_Neg;
+  Double_t*   fA_Neg;         // [fNelem] ADC amplitudes of blocks
   Double_t*   fA_Pos_p;	      // [fNelem] pedestal subtracted ADC amplitudes
-  Double_t*   fA_Neg_p;
+  Double_t*   fA_Neg_p;	      // [fNelem] pedestal subtracted ADC amplitudes
 
   Double_t* fEpos;     // [fNelem] energy depositions seen by positive PMTs
   Double_t* fEneg;     // [fNelem] energy depositions seen by negative PMTs