Update README.md

Author: padeken

README.md

@@ -35,6 +35,9 @@ and then run the Analyzer again e.g.:
 gdb --args ./Analyzer -in /uscms_data/d3/cfgonzal/ZprimeAnalysis/2017_BSG3G/CMSSW_8_0_10/src/LIST_SAMPLES/ZprimeSamples/OutTree_Zprime3000.root -out test_2.root
 ```
 
+then say ```run``` and when it crashes say ```where```
+
+
 If you get a setfault, it can mean one of two things.  If the error looks like:
 
 ```