diff --git a/dataOnESGF.md b/dataOnESGF.md
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----
-title: Obs4MIPs data available on ESGF 
-rank: 3
----
-
-## Obs4MIPs data availability via ESGF
-
-CMIP model output is made available via the [Earth System Grid Federation (ESGF)](https://esgf-node.llnl.gov/projects/esgf-llnl) along with data from other projects including some obs4MIPs.    
-Obs4MIPs data published on ESGF is available as a companion project of CMIP via [Metagrid](https://aims2.llnl.gov/search). Currently, efforts are underway to introduce new datasets to obs4MIPs as well as to update existing products.  ESGF is a primary platform for making many obs4MIPs compliant data available.  
-
-
diff --git a/docs/dataoverview.md b/docs/dataoverview.md
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+---
+title: Obs4MIPs data available on ESGF 
+rank: 3
+---
+
+## Technical alignment with CMIP
+
+As with CMIP model output, obs4MIPs data products are provided as netCDF files with one variable per file.  The template for obs4MIPs filenames,  described in the obs4MIPs data standards, is as follows:
+
+obs4MIPs file name template =
+<variable_id>_<frequency>_<source_id>_<variant_label>_<grid_label>[_<time_range>].nc
+e.g., siconc_mon_OSI-SAF-450-a-3-0_PCMDI-BE_gr1_185001-202301.nc
+
+In some cases an entire timeseries is saved as a single file, but for larger datasets timeseries often span across multiple files.